Kumar, Santosh, Patrick, Christopher E., Edwards, R. S. (Rachel S.), Balakrishnan, Geetha, Lees, Martin R. and Staunton, Julie B. (2020) Torque magnetometry study of the spin reorientation transition and temperature-dependent magnetocrystalline anisotropy in NdCo5. Journal of Physics: Condensed Matter, 32 (25). 255802. doi:10.1088/1361-648X/ab7ad6 ISSN 0953-8984.

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Abstract

We present the results of torque magnetometry and magnetic susceptibility measurements to study in detail the spin reorientation transition (SRT) and magnetic anisotropy in the permanent magnet NdCo5. We further show simulations of the measurements using first-principles calculations based on density-functional theory and the disordered local moment picture of magnetism at finite temperatures. The good agreement between theory and experimental data leads to a detailed description of the physics underpinning the SRT. In particular we are able to resolve the magnetization of, and to reveal a canting between, the Nd and Co sublattices. The torque measurements carried out in the ac and ab planes near the easy direction allow us to estimate the anisotropy constants, K 1, K 2 and K 4 and their temperature dependences. Torque curves, τ(γ) recorded by varying the direction of a constant magnetic field in the crystallographic ac plane show a reversal in the polarity as the temperature is changed across the SRT (240 < T < 285 K). Within this domain, τ(γ) exhibits unusual features different to those observed above and below the transition. The single crystals of NdCo5 were grown using the optical floating zone technique.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics Q Science > QD Chemistry
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Anisotropy, Density functional, Magnetization, Magnetic structure
Journal or Publication Title:	Journal of Physics: Condensed Matter
Publisher:	Institute of Physics Publishing Ltd.
ISSN:	0953-8984
Official Date:	25 March 2020
Dates:	Date Event 25 March 2020 Published 27 February 2020 Accepted 30 January 2020 Modified 15 October 2019 Submitted
Volume:	32
Number:	25
Article Number:	255802
DOI:	10.1088/1361-648X/ab7ad6
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Copyright Holders:	The authors
Date of first compliant deposit:	8 April 2020
Date of first compliant Open Access:	8 April 2020
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID EP/M028941/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 EP/M028771/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266

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